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md/raid1, raid10: move rXbio accounting closer to allocation.

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When raid1 or raid10 find they will need to allocate a new
r1bio/r10bio, in order to work around a known bad block, they
account for the allocation well before the allocation is
made.  This separation makes the correctness less obvious
and requires comments.

The accounting needs to be a little before: before the first
rXbio is submitted, but that is all.

So move the accounting down to where it makes more sense.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown
2017-03-15 14:05:13 +11:00
committed by Shaohua Li
parent 97d5343808
commit 6b6c8110e1
2 changed files with 20 additions and 26 deletions
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24
drivers/md/raid1.c
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@@ -1436,18 +1436,9 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
goto retry_write;
}
if (max_sectors < r1_bio->sectors) {
/* We are splitting this write into multiple parts, so
* we need to prepare for allocating another r1_bio.
*/
if (max_sectors < r1_bio->sectors)
r1_bio->sectors = max_sectors;
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
}
sectors_handled = r1_bio->sector + max_sectors - bio->bi_iter.bi_sector;
atomic_set(&r1_bio->remaining, 1);
@@ -1553,10 +1544,17 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio)
* as it could result in the bio being freed.
*/
if (sectors_handled < bio_sectors(bio)) {
r1_bio_write_done(r1_bio);
/* We need another r1_bio. It has already been counted
/* We need another r1_bio, which must be accounted
* in bio->bi_phys_segments
*/
spin_lock_irq(&conf->device_lock);
if (bio->bi_phys_segments == 0)
bio->bi_phys_segments = 2;
else
bio->bi_phys_segments++;
spin_unlock_irq(&conf->device_lock);
r1_bio_write_done(r1_bio);
r1_bio = alloc_r1bio(mddev, bio, sectors_handled);
goto retry_write;
}